Compilare: user.c: In function ‘prim’: user.c:14: warning: implicit declaration of function ‘marcare’ user.c: At top level: user.c:17: warning: conflicting types for ‘marcare’ user.c:14: note: previous implicit declaration of ‘marcare’ was here user.c: In function ‘main’: user.c:44: warning: format ‘%lu’ expects type ‘long unsigned int’, but argument 3 has type ‘long long unsigned int’ user.c:32: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result